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The Windows installation comes with Tcl/Tk version 8.6 which has some
new features (compared to 8.5) that are very important to me.

may I ask which features of 8.6 you need in particular? I'm just
curious, because I thought that Python mainly uses the Tk part, and
there has not been much of a difference in Tk between 8.5 and 8.6. In
contrast, the Tcl language itself got massively enhanced (stackless
execution engine, coroutines, core OO system, ...)